With a population increase of 1.5 billion by 2050, Asia’s demand for food will double, says the report from the UN’s Food and Agriculture Organisation (FAO) and the World Bank-funded International Water Management Institute (IWMI).

The UN has said that billions of dollars will be needed to improve irrigation in Asia. Photograph: Stringer/India/ReutersWith very little new land left for cultivation, combined with unpredictable climate and dwindling water supplies, only more effective management of existing water supplies will feed starving people.

The report says that water tables in parts of India and China have dropped catastrophically in the last few years.

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